# Relaxation phenomena in alcoholic isomers by brillouin scattering

Majolino, Domenico and Magazù, S. (1991) Relaxation phenomena in alcoholic isomers by brillouin scattering. Accademia Peloritana dei Pericolanti Classe FF.MM.NN., 69. pp. 151-160.

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Hypersonic velocity and normalized absorption of $n$-Pentanol $(n P_eOH)$ +2—Methyl—2—Butanol $(2M — 2B_uOH)$ mixtures were measured as a function of scattering angle and of $n P_eOH$ molar fraction, in the temperature range from —15°C up to 45°C. The experimental results indicate a shear relaxation phenomenon as the one detected on pure liquids. The temperature evolution of the viscoelastic parameters $(\tau_s and G_\infty)$ suggests that the mixing of the two isomers produces hetero alcohol aggregates. The results are analyzed in the framework of the Angell’s picture of “strong” and “fragile” liquids.